指纹识别代码

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/**
 * Small helper class to manage text/icon around fingerprint authentication UI.
 */
public class FingerprintUiHelper extends FingerprintManager.AuthenticationCallback {

    private static final long ERROR_TIMEOUT_MILLIS = 1600;
    private static final long SUCCESS_DELAY_MILLIS = 1300;

    private final FingerprintManager mFingerprintManager;
    private final Callback mCallback;
    private CancellationSignal mCancellationSignal;

    private boolean mSelfCancelled;

    /**
     * Constructor for {@link FingerprintUiHelper}.
     */
    public FingerprintUiHelper(FingerprintManager fingerprintManager, Callback callback) {
        mFingerprintManager = fingerprintManager;
        mCallback = callback;
    }

    public boolean isFingerprintAuthAvailable() {
        // The line below prevents the false positive inspection from Android Studio
        // noinspection ResourceType
        return mFingerprintManager.isHardwareDetected() && mFingerprintManager.hasEnrolledFingerprints();
    }

    public void startListening(FingerprintManager.CryptoObject cryptoObject) {
        if (!isFingerprintAuthAvailable()) {
            return;
        }
        mCancellationSignal = new CancellationSignal();
        mSelfCancelled = false;
        // The line below prevents the false positive inspection from Android Studio
        // noinspection ResourceType
        mFingerprintManager.authenticate(cryptoObject, mCancellationSignal, 0 /* flags */, this, null);
    }


    public void stopListening() {
        if (mCancellationSignal != null) {
            mSelfCancelled = true;
            mCancellationSignal.cancel();
            mCancellationSignal = null;
        }
    }

    @Override
    public void onAuthenticationError(int errMsgId, CharSequence errString) {
        Log.d("djh", "onAuthenticationError");
        if (!mSelfCancelled) {

        }
    }

    @Override
    public void onAuthenticationHelp(int helpMsgId, CharSequence helpString) {
        Log.d("djh", "onAuthenticationHelp");
        showError(helpString);
    }

    @Override
    public void onAuthenticationFailed() {
        Log.d("djh", "onAuthenticationFailed");
    }

    @Override
    public void onAuthenticationSucceeded(FingerprintManager.AuthenticationResult result) {
        Log.d("djh", "onAuthenticationSucceeded");
        stopListening();
    }

    private void showError(CharSequence error) {
    }


    public interface Callback {

        void onAuthenticated();

        void onError();
    }

 

安全对象

public class CryptoObjectHelper { // This can be key name you want. Should be unique for the app.
    static final String KEY_NAME = "com.easylinks.sandbox.fingerprint_authentication_key";
    static final String KEYSTORE_NAME = "AndroidKeyStore";
    static final String KEY_ALGORITHM = KeyProperties.KEY_ALGORITHM_AES;
    static final String BLOCK_MODE = KeyProperties.BLOCK_MODE_CBC;
    static final String ENCRYPTION_PADDING = KeyProperties.ENCRYPTION_PADDING_PKCS7;
    static final String TRANSFORMATION = KEY_ALGORITHM + "/" + BLOCK_MODE + "/" + ENCRYPTION_PADDING;
    final KeyStore _keystore;

    public CryptoObjectHelper() throws Exception {
        _keystore = KeyStore.getInstance(KEYSTORE_NAME);
        _keystore.load(null);
    }

    public FingerprintManager.CryptoObject buildCryptoObject() throws Exception {
        Cipher cipher = createCipher(true);
        return new FingerprintManager.CryptoObject(cipher);
    }

    Cipher createCipher(boolean retry) throws Exception {
        Key key = GetKey();
        Cipher cipher = Cipher.getInstance(TRANSFORMATION);
        try {
            cipher.init(Cipher.ENCRYPT_MODE | Cipher.DECRYPT_MODE, key);
        } catch (KeyPermanentlyInvalidatedException e) {
            _keystore.deleteEntry(KEY_NAME);
            if (retry) {
                createCipher(false);
            } else {
                throw new Exception("Could not create the cipher for fingerprint authentication.", e);
            }
        }
        return cipher;
    }

    Key GetKey() throws Exception {
        Key secretKey;
        if (!_keystore.isKeyEntry(KEY_NAME)) {
            CreateKey();
        }
        secretKey = _keystore.getKey(KEY_NAME, null);
        return secretKey;
    }

    void CreateKey() throws Exception {
        KeyGenerator keyGen = KeyGenerator.getInstance(KEY_ALGORITHM, KEYSTORE_NAME);
        KeyGenParameterSpec keyGenSpec = new KeyGenParameterSpec.Builder(KEY_NAME, KeyProperties.PURPOSE_ENCRYPT | KeyProperties.PURPOSE_DECRYPT).setBlockModes(BLOCK_MODE).setEncryptionPaddings(ENCRYPTION_PADDING).setUserAuthenticationRequired(true).build();
        keyGen.init(keyGenSpec);
        keyGen.generateKey();
    }
}

调用

if (FingerPrintUtiles.isFingerprintAuthAvailable(MainActivity.this)){
    FingerprintManager mFingerprintManager = getSystemService(FingerprintManager.class);
    FingerprintUiHelper fingerprintUiHelper = new FingerprintUiHelper(mFingerprintManager, callback);

    try {
        CryptoObjectHelper cryptoObjectHelper = new CryptoObjectHelper();
        fingerprintUiHelper.startListening(cryptoObjectHelper.buildCryptoObject());
    } catch (Exception e) {
        e.printStackTrace();
    }
}else{
    ToastUtil.showToastLong(MainActivity.this,"not fingerprint function!");
}

转载于:https://my.oschina.net/u/1177694/blog/898167